1 files changed, 40 insertions, 0 deletions
diff --git a/testing/web-platform/tests/fetch/api/basic/stream-response.any.js b/testing/web-platform/tests/fetch/api/basic/stream-response.any.js
new file mode 100644
index 0000000000..d964dda717
--- /dev/null
+++ b/testing/web-platform/tests/fetch/api/basic/stream-response.any.js
@@ -0,0 +1,40 @@
+// META: global=window,worker
+// META: script=../resources/utils.js
+
+function streamBody(reader, test, count = 0) {
+  return reader.read().then(function(data) {
+    if (!data.done && count < 2) {
+      count += 1;
+      return streamBody(reader, test, count);
+    } else {
+      test.step(function() {
+        assert_true(count >= 2, "Retrieve body progressively");
+      });
+    }
+  });
+}
+
+//simulate streaming:
+//count is large enough to let the UA deliver the body before it is completely retrieved
+promise_test(function(test) {
+  return fetch(RESOURCES_DIR + "trickle.py?ms=30&count=100").then(function(resp) {
+    if (resp.body)
+      return streamBody(resp.body.getReader(), test);
+    else
+      test.step(function() {
+        assert_unreached( "Body does not exist in response");
+      });
+  });
+}, "Stream response's body when content-type is present");
+
+// This test makes sure that the response body is not buffered if no content type is provided.
+promise_test(function(test) {
+  return fetch(RESOURCES_DIR + "trickle.py?ms=300&count=10&notype=true").then(function(resp) {
+    if (resp.body)
+      return streamBody(resp.body.getReader(), test);
+    else
+      test.step(function() {
+        assert_unreached( "Body does not exist in response");
+      });
+  });
+}, "Stream response's body when content-type is not present");